Belt loop sewing machine



6 Sheets-Sheet 1 INVENTOR.

ATTORNEY.

- v JOSEPH GALKIN Nav. 11, 1941.

J. GALKIN BELT LOOP SEWING MACHINE Filed June 14, 1940 6 Sheets-Sheet 2 INVENTOR.

BYW

ATTORNEY.

Nov. '11, 1941. J. GAL KIN 2,262,547

BELT LOOP SEWING MACHINE Filed Ju ne 14, 1940 6 Sheets-Sheet 3 JOSEPH GALKlN I NV EN TOR.

BYWMMM ATTORNEY.

Nov. 11, 1941. J. GAL-KIN BELT LOOP SEWING MACHINE Filed June 14, 1940 a Sheets-Sheet 4 JOSEPH GALKIN INV EN TOR.

ATTORNEY.

Nov. 11, 1941.

J. GALKIN BELT LOOP SEWING MACHINE Filed June 14, 1940 6 Sheets-Sheet 5 ATTORNEY.

Nov. 11, 1941.

J. GALKIN BELT LOOP SEWING MACHINE Filed Jime 14, 1940 I 6 Sheets-Sheet s W W? i W i JOSEPH GALKIN 147. BYW

INV EN TOR.

ATTORNEY.

even after the Patented Nov. 11; 1941 STAT A ENT kernel:

am 1.00; sawiNGMAcmNE Joseph camanewY-ork, N. Y. i Application June 14; 1941?, Serial No. 340,577 I (arm-2) 3 Claims.

This invention relates to improvements in sewing machines whereby belt loops for trousers are automatically produced in a single operation by mechanism which cuts scraps of cloth into strips and folds said strips into belt loop' form and feeds said folded material with upper and-lower. feed-dogs while being stitched with two spaced needles.

An object 'of this invention. is to provide two 'upper 4-motion feed-dogs resiliently mounted one behind the other for joint up and down movement, so as to automatically adapt itself for feeding materials of different thicknesses.

Another object of this invention is to provide a combined feeding means and reciprocatory' cutting means comprising two reciprocatory cutters respectively mounted at each side of said feeding means and adapted to simultaneously cut a scrap of material to predetermined strip form and feed said strip. towards the stitching mechanism. v

" Another object of this invention is to provide a 'folder disposed between the trimming and stitching mechanism for .foldingboth trimmed edges ofthe strip and having a through linear passage with parallel walls in its upper face for a rectangular "feed-dogs adapted for automatically feeding the folded material through the folder andalong a portion of the length of thefpresser-foot and directlyto the stitch form-- ing mechanism.

This application is alcontinuation in part of my application, Serial No. 298,504, filed October Another described a presser-foot'having a passageway object ofv this invention is to provide in a belt loop machine of." the character mg drawings and pointedout in the claims which form part of this specification.

Reference will now be had tothe drawings, wherein like numerals of reference designate corresponding parts the fabric.

Figure v5 is a fragmentary side view of the feeding mechanism shown in Figure 4, the

presser-foot being omitted. l

centrally and'lengthwise thereof, the width of] said passageway being adapted for receiving finished belt loops, and a feed-dog constructed with feeding teeth in its central portion only and the said teeth being positioned for move- .ment inside said passageway for feeding finished belt loops. Y

Another object of this invention is to provide means for feeding a tape into. the folded belt loop material, theitape serving for chaining the threads and so that the threads will not break belt loopfabric has passed the needles.

With the above and other objects in view, the invention will be hereinafter more particularly described, and the combination and arrangement of parts will'be shown in the accompany- "dog.

Figure 6 isa plan viewof theneedle-plate and folder and shear blades, on an enlarged scale.-

Figure 7 is aside view of the presserfoot, needle plate, folder and shear blade:,.'-

Figure 8 is a cross-sectional view, the section being taken as on line 8-8 in Figure 6, the foot being on the needle-plate. r

Figure'9 is a cross-sectional Figure 10 is a top plan .view of thelower feed Figure 11 is a perspective view of two shear bladesin assembled relation in a blade carrier. Figure 12 is a diagrammatic sectional view on an enlarged scale through the folder.

Figure 13 is a fragmentary plan view showing a modified drive for the movable shear blades.

Figure 14 is a cross-sectional view of the shear blade drive shown in Figure. 13; the section being 1 taken as on line I l-l4 in Figure 13.

In the illustrated embodiment of the invention,

the numeral Ill indicates the work supporting base of a sewing machine embodying my invention and which comprises the usual standard II,

having an overhanging arm I! with a head I31 at its free end. In the head l3 isjournalled the A usualreciprocatory needle-bar I4 carrying two spaced needles IS. The needle-bar is reciprocated by a lever Hi mounted on a pivot shaft I1. A looper IB- is oscillated and cooperates with the two spaced needles. The looper thread inter locks with the needle threads to form stitching as is well known in the sewing machine art.

The material worked upon is held down by a throu'ghoutthe several views, in which: i

viewof an assembled top feed pressure bracket and plunger for resiliently downpressing the top feed dogs.

presser-foot l3 resting on a needle-plate secured to the work supporting base I0.

Projecting through the needle-plate 20 is a lower feed-dog 2|. The feed-dog 2| is carried by a feed-bar 22 attached to a feed rocker 23. The feed rocker 23 is oscillated by an arm 24 connected in the usual manner to a link or pitman 25 on the forward endof the main shaft 26. The feed-bar 22 is raised and lowered by an eccentric 21 on the main shaft 26.

By actuating a screw 26, Figure 3, the link or pitman 25 is caused to move to or away from the center of the main shaft 26 and causes the arm 24 to impart a larger or smaller swing to a stub shaft 29 and feeding movements to the feeddog 2|.

The foot I!) has its shank 30 secured to the lower end of a presser bar 3| which is supported in the head I3 in the'usual manner. Pressure is maintained upon the foot I9 by a leaf spring 32 pressing upon the presser-bar 3|.

The invention is particularly directed to a combination of mechanisms operating upon scraps of cloth for forming belt loops therefrom in a single and lowered by an eccentric 58 mounted on the main shaft 26.

As shown in Figures 4 and 5 the top feed-dog for feeding the scrap or strip fabric to the shear blades 31, 31' has been pivotally mounted on a pin 66 passing through the top feed-dog 36. The top feed-dog 35 is positioned for movement between the movable blades 31, 31'. A leaf spring 6| secured at one end by a screw 62 to the feed-dog 35 and in tensioned engagement at its free upper end with the upright front wall of the operation. The invention consistsof a trimming mechanism 33 for trimming two fabric edges so as to prepare a strip of predetermined width, a folder 34 for folding the strip into belt loop form and directing the same to the stitching mechanism for stitching the belt loop. The invention also provides a top feed-dog 35 for feeding the strip to and through the trimming mechanism, and a top feed-dog 36 for feeding the cut strip to and through the folder and to the stitching machine. The top feed-dogs 35 and 36 are operated in timed relation with the lower feeddog 2|.

The forward top feed-dog 35 feeds the scrap fabric to and through movable shear blades 31, 31' held in carriers 38, 38'. The movable blade carriers are slidably mounted on a rock shaft 39. The carriers 38, 38 are keyed to the shaft 39 by a key 40 and are resiliently pressed by coil springs 4| in the direction of the stationary shear blades 41. The springs 4| react against collars 42 fixedly mounted on the shaft 39. The stationary shear blades 41 areheld in properly spaced cutting relation by being held in a blade carrier 43 of the desired width. The movable shear blades 31, 31'

thus cooperate with the stationary shear blades 41 to cut a fabric strip of predetermined width.

The movable shear blades 31, 31' are given substantially vertical movementsby the carriers 38, 38'. The carriers slidably engage the elongated key 40. The key is held in fixed parallel relation with the rock shaft 39' by being held in an arm 44 fixed to said shaft. -An arm 45 has been fixed to one end of the shaft 39 and is pivotally connected to a vibrating connection 46 operated by an eccentric 48 on the main shaft 26. As the shaft 26 rotates, the rock shaft 33 actuates the movable shear blades 31, 31' once for each revolution of the main shaft'26.

' As shown in Figures 4 and 5, the rearward top feed-dog 36 is elongated and serves for feeding the folded strip of fabric through the folder 34 and to the central portion of the feed-dog 2|. The feed-dog 36 has been mounted on a pivot 53 at one end of a top feed bracket 54 and adapted for reciprocating motion in a linear passage 55 extending through the entire length of the upper wall of the folder 34. The top feed bracket top feed-dog 36 serves to press the top feed-dog 35 against the upper surface of the blade carrier 43 for the stationary blades 41, and in pressure contact with the work. The uppersurface of the blade carrier 43 is at the level of a raised front extension 63 of the base H).

The top feed-dog 35 has feeding teeth 64 extending across the entire lower surface thereof. The teeth 64 face in the same direction as the teeth 65 on the top feed-dog 36, and in the same direction as the teeth '66 on the lower feed-dog As shown in Figure 4, it will be seen that the front top feed-dog 35 is considerably wider than the rear top feed-dog 36. In practice, the feed-v dog 35 feeds strip fabric cut to the size of a blank belt loop, while the feed-dog 36 feeds folded fabric of the proper belt loop form.

The top feed bracket 54 is normally maintained in a substantially horizontal position by means of a collar fixed to the pivot 56 and having a vertical extension 61 resting against a horizontally adjustable screw 63 in the feed-bar extension 51. The feed-bar extension 51 is carried by a feed-bar 63 attached to the feed rocker 23, and is caused to move up and down by the eccentric 58 on the main shaft 26'.

I have provided a resilient means for downpressing the top feed-dog 36 into engagement with the folded belt-loop fabric and so that the teeth of the top feed-dog will be adapted for feeding the belt loop fabric through the folder and directly to the needles. This resilient means comprises a tubular guide or housing 85 secured to the head l3 by a flange 86. As shown in Figure 9, a top feed plunger 81 has a collar 88 on which a coil spring 83 seats and reacts against an adbracket 54 and both feed-dogs 35 and 36 as a unit.

The contacting portion of the end 81' houses a ball 9|.

It will thus be noted that. the front top feed-dog 35 is resiliently downpressed by the spring 6| against the upper cutting surface of the blade 43 independently of the joint downpressing by the spring 83.

As shown in Figure 5, it will be noted that the length of the top feed-dog 36 is longer than the length .of the passageway in the folder 34 and that the top feed-dog engages the folded strip in the folder and feeds it the entire length of the folder, along a portion of the length of the presser-foot, and directly to the needles.

When the sewing machine is in operation, the top feed bracket 54 is actuated up and down by the eccentric 58 and forward and backward by the feed rocker 23. The attached top feed-dog 36 and the pivotally mounted top feed-dog 35 thus have 4-m'otion feeding movements imparted I thereto, similar to the 4-motion feeding movements of the feed-dog 2|. The lower feed-dog feeds the folded fabric through the passageway x has passedthe needles a considerable distance;

92 by pressure contact with the lower surface of said fabric. v

As best shown in Figure 6, the feed-dog, II is; made with'feeding teeth 63 in its central portiononly. The overall width of the feeding teeth 33' is made to correspond to the width of the belt loops in folded and finished form. The centrally positioned teeth serve to feed the folded belt loop strip through thepassageway 92' in the 'foot I3 It is to be noted that the sidebars 33, 93 of the feed-dog 2| do not "haveany teeth and merely As best shown in,Figures 1, 2, a and a, the "m I I9 has a lu'g I24 extendingsideways therefrom. The slug [241s positioned below the topf feed bracket 54. It is thus possible to raise the'bracket 34 by. raising the bar II.

"1 As shown in Figure -11, the stationary shear ,supported square, withfour cutting edges; Each 4 serve to connect the front and rear teeth 83, C3,

in unitary relation, I

'. As shown 1 Figure 7, the foot' I3 comprises a center member 94 which-is vertically movable 'in the passageway 32 and which is pressed downwardly by an elongated spring 35' into contact withthe needle-plate and holds the threads against the needle-plate to allow chaining ofsaid threads. The rear end of member 34 is downpressed by a coil spring I02.

The center member 94 has a vertical'aperture 96 through which passes a pivotll'lr The member 94 has an upwardly sloping front end "38 and a bevelled rear end 93 to permit the said member to rise when the folded belt-loop passes under its front end..

It is to be understood mains indirect contact with the needle plate 23 1 under normal operating conditions and that the side walls defining the passageway 32 in'the foot jointly with the needle-plate surface and with r the center member 94 form a rectangular channel corresponding to the rectangulancross-section of a finished belt-loop. The height of the side bars 93 of the feed-dog 2-I is'reduced so as to leave a clearance between the upper surface of said bars and the lower surface of the foot' I9.

' The raising of thecenter member 94 is accom plish ed by the central teeth 66.

that the foot l9 re-' blades 4! are made-in the form of a centrally blade maythus be turned ninety degrees about a pivot screw I23 tobring'an interchangeable'cutting edge into the upper cutting position. The.

overall width of an assembled set of blades and blade carrier 43 may be varied to suit different widths of belt loops. The carrier has been fastened to an elongated bracket I23 in which the shaft 39 is mounted. I

Figures 13 and14 show a modified drive for the movable shear-blades. Asshown, the blade carrier I38 has been rotatably mounted on a stationary shaft I39. The shaft I33 is fixed in the bracket I25. The blade carrier I38 has an integral extension I40: which is ball-jointed at its lower end at I. The ball-joint MI is' connected to one end of a vibrating connection I42. The opposite end .I43 of the connection I-.42- is'connected to the eccentric 21. The eccentric 21 is As shown in Figures 6 and 12, the folder34 has a tongue I20 about which the out belt loop-strip is folded underneath the strip; The tongue is supported by a central support I2-I.

I have provided a knife shield for the fingers of the operator; The shield comprises two angular arms I I3 which are integral with the folder 34 and extend forwardly above and between the movable blades 31, 31'.

dog 35 has clearance on each side thereof to operate freely between the said angular shield arms. Referring to Figures 2 and 5, it,will be note that I have provided a slot I I5 in the raised front extension 63 of the base III. The slot '5' is positioned centrally of the folder 34 and serves for feeding a tape III through the folder and provides a positive means for feeding the'finished belt loops II8 when passing beyond the needles I5, without breaking the thread. The tape is fed from a spool (not shown) below the'base of the sewing machine. The tape I-Il passesbelow the top feed-dog 35 and below the top feed-dog 36, through the folder 34, and to the needles and is stitched integrally within the beltloop H8. The tape is concealed inside the belt loop and is visible at both ends of the finished belt loop.

The tape forms a continuous fabric stripextending from one belt loop to another, and when one scrap of fabric has been formed into a belt loop andypasses the needles, the tape'extends rearwardly from the finished belt loop and provides fabric on which the needles can continue their stitching operations. The tape thus serves as; a means for chaining the threads without breaking them even after the finished belt loop The reciprocable feed- I thus adapted to actuate the shear blades I38, I33, and the feed-dog 2 I. A pin I44 fixed in the carrier I38 and slidably mountedin the carrier I38, serves to actuate the carrier I38 about the fixed front shaft I39.

In accordance with the patent statutes 1 have described and' illustrated the preferred embodiments of my invention, but it will be understood that various changes and modifications can be made thereinwithout departing from the spirit of theinvention as defined by the appended claims. l l

I claim;

1. In combination witha sewing machine for forming stitched belt loops from untrimm'ed scrap fabric, in a single operation, comprising mechanism for simultaneously" trimming both edges of a strip of fabric and downfolding the trimmed edges while top feeding the'unfolded and the folded portions of said strip with pivotally connected 4-motion top feed-dogs including teeth extending beyond the folder andalong a portion of the length of the presser-foo-t, a work supporting base and twospaced needles two top feed- A dogs placed one behind the other and being mounted for 4-motion feeding movements in frontof said needles, means for resiliently downpressing said top feed-dogs, reciprocatory shear blades I mounted on a shaft positioned below said work supporting baseQsaid blades being respectively po-' sitioned on opposite sides of the forward top feeddog' for cutting an automatically fed strip of fabric of predetermined width,- a foot having two rigid side bars forming a fixed guideway centrally.

and lengthwise thereof, a folder for folding both 1 side edges of said sheared strip of fabric underneath said strip and having a linear passage in its upper wall and a folding tongue positioned above said worksupporting base, said reciprocaltory shear blades coacting with a stationary duplex blade having a flat upper surface, saidsurface being positioned in alignment with said .folder I tongue, the rear top feed-dog being mounted in said passage for feeding the folder fabric through said folder and along a portion of the length of said foot and directly to said needles, the width both edges of a strip and reciprocally top feeding and finishing belt loops in a single operation, the combination with a sewing machine having a work supporting base and two spaced needles, two top feed-dogs placed one behind the other and being mounted for 4-mo tion feeding movements in front of said needles, means for resiliently and jointly downpressing said top feed-dogs, reciprocatory shear blades mounted on a shaft positioned below said work supporting base, said blades being respectively positioned on opposite sides of the forward top feed-dog for cutting an automatically fed strip of fabric of predetermined width, a foot having two rigid side bars forming a fixed guideway centrally and lengthwise thereof, a folder for folding both side edges of said sheared strip of fabric underneath said strip and having a linear passage in its upper wall and a folding tongue positioned above said work supporting base, said reciprocatory shear blades coacting with a stationary duplex blade having a flat upper surface, said front top feed-dog being pivotally mounted relative to said rear top feed-dog, and means for resiliently pressing said front top feed-dog against said cutting surface independently of said joint resilient down-pressing, said surface being positioned in alignment with said folder tongue, the rear top feed-dog being mounted in said passage for feeding the folded fabric through said folder and along a portion of the length of said foot and directly to said needles, the width of said foot guideway being adapted for folded belt loops, a spring-pressed center presser-foot member vertically movable in said guideway and having needle holes, a lower feed-dog having feeding teeth only at its central portion and being positioned for movement inside said guideway for feeding folded belt loops pressed down by said center presser-foot member, said lower feed-dog teeth being positioned at the front and rear of said needles, and means for actuating said upper feeddogs in timed relation with said lower feed-dog.

3. In a mechanism for simultaneously trimming both edges of a strip and reciprocally top feeding and finishing belt loops in a single opersition, the combination with a sewing machine having a work supporting base and two spaced needles and means for forming interlock stitching, two top feed-dogs placed one behind the other and being mounted for 4-motion feeding movements in front of said needles, ,means for resiliently and jointly downpressing said top feed-dogs, reciprocatory shear blades mounted on a shaft positioned below said work supporting base, said blades being respectively positioned on opposite sides of the forward top feed-dog for cutting an automatically fed strip of fabric of predetermined width, a foot having two rigid side bars forming a fixed guideway centrally and lengthwise thereof, a folder for folding both side edges of said sheared strip of fabric underneath said strip into abutting relation, said folder having a linear passage in its upper wall and a folding tongue positioned above said work supporting base, said reciprocatory shear blades coacting with stationary blades secured to opposite faces of a stationary blade carrier having a flat upper surface, said front top feed-dog being pivotally mounted on a pivot carried by said rear top feed-dog, and means for resiliently pressing said front top feed-dog against said surface independently of said joint resilient downpressing, said surface being positioned in alignment with said folder tongue, the rear top feed-dog being mounted in said folder passage for feeding the folded fabric through said folder and along a portion of the length of said foot and didirectly to said needles, the width of said foot guideway beingadapted for the passage of folded belt loops, a spring-pressed center member vertically movable in said presser-foot guideway and having needle holes, a lower feed-dog having feeding teeth only at its central lengthwise portion and being positioned for movement inside said guideway for feeding folded belt loops pressed down by said center presser-foot member, said lower feed-dog teeth being positioned at the front and rear of said needles, and means for actuating said upper feed-dogs in timed relation with said lower feed-dog.

- JOSEPH GALKIN. 

